package factory;

import dao.NewsDao;
import dao.impl.NewsDaoImpl;
import dao.impl.NewsDaoMySqlImpl;
import dao.impl.NewsDaoOracleImpl;
import dao.impl.NewsDaoRedisImpl;

public class SimpleDaoFactory {
    /**
     * 创建 NewDao 实例的工厂方法
     */
    //示例 1
    public static NewsDao getInstance1(){
        return new NewsDaoImpl();
    }

    public static NewsDao getInstance2(String key){
        switch (key){
            case "mysql":
                return new NewsDaoMySqlImpl();
            case "oracle":
                return new NewsDaoOracleImpl();
            case "redis":
                return new NewsDaoRedisImpl();
            default:
                throw new RuntimeException("无效的数据库类型："+key+"，DAO获取失败");
        }
    }
}